Differential-speed agitator drive



3 Sheets-Sheet l s. SCHIFF DIFFERENTIAL SPEED AGITATOR DRIVE Filed Dec. 8, 1927 Dec. 16,

Dec. 16, 1930. s. SCHlFF 1,785,562

DIFFERENTIAL SPEED AGITATOR DRIVE Filed Dec. 8, 1927 3 Sheets-Sheet 2 v gwue'nioc /Z. Z. Y ggnvund 56/7/77;

Dec. 16, 1930. s. sc F 1,785,562

DIFFERENTIAL SPEED AGITATOR DRIVE Filed Dec. 8, 1927 3 Sheets-Sheet 5 attozucqw.

SIGMUND SCENE, OI CINCINNATI, O O, ASSIGNOR TO THE J. H. DAY COMP-ANY, O! CINCINNATI, OHIO, A CORPORATION OF OHIO mrrnnnmm-srnnn nerra'roa muvn Application Med December 8, 1927. Serial No. 238,643.

g Y This invention. relates to a power transmiskeyed to'the drive shaft 21 and are adapted sion and change speed mechanism and has to mesh with gears 30 and 31 respectively for an object the provision of such mechanism which are splined upon the counter-shaft 27. wherein power from a continuous speed me- Suitable means hereinafter described are prodium may be transmitted through several vided for shifting the slidable gear unit 55 gear trains to attain several speeds. -31 to obtain engagement between ears The present invention more specifically re- 28 and 30 or between gears 29 and 31. mm lates to a differential speed transmission for the foregoing itwill be apparent that the use in cake mixers and provides certain imgear unit 3031 may be placed in an inter- I0 provements on the kindred device shown in mediate position wherein the counter-shaft so my application for patent Serial N 0. 210,408 27 receives no power from the drive shaft 21, filed August 3, 1927. or the gears ma be shifted for attaining dif- .Another object is to provide a cake mixer ferent speeds d etermined by the gear ratio. a wherein the beater element may be moved Freely revoluble upon the drive shaft 21 15 through a circumference and at the same is an internal ring gear assembly indicated 05 I time rotated on its axis at any one of a numgenerally as 32 and provided with an upper ber of predetermined speeds. internal ring ear 33 and a lower internal 1 These and other objects are attained by the ring gear 34 w ich operates as a unit. The means described herein and disclosed in the lower end of counter-shaft27 carries a pinso accompanying drawings, in which: ion which is in constant mesh with the u 7o ig. 1 represents a cake mixing apparatus per ring gear 33. From the foregoing it Wlll having embodied therein a device of the ine appa t tha ro ation may be imparted to vention. the rm gear structure 32 from the drive 1 Fig.2 is a view taken on line 2-2 of Fig. Shaft W B the ge s 28 and 30 g rs 25 1 showing a longitudinal section of the deand 31 are meshed so that the ring gear 32 vice. may be rotated upon rotation of the drive Fig. 3 is a view taken on line 33 of Fig. 2, shaft 21. A disc 36 which is provided with an ig. 4 is a'view taken on line 4--4; of Fig. 3. extended hub portion 37 is also mounted for Int e herein disclosed embodiment the cake free rotation upon the lower end of shaft 21- mixer is provided with the usual head 10 dis- The disc 36 carries a freely rotatable pinion so posed over the mixin bowl 11 in which the 38 which meshes with the lower ring gear 34 agitator or beater 12 is disposed. The agitaand also with a pinion 39 which is keyed upon tor in this embodiment rotates about its axis drive shaft 21. It will be apparent that when 'and'also moves throughacircumferencein the the gear 35 rotates to drive the ring gear bowl thereby attainin a more efiicient mixing structure 32 in one direction at the same of the contents of the owl. rate as the drive shaft 21 rotates pinion 39 in A sprocket 13 supplies the continuously the opposite direction, or in other words a one operating power throu h asuitable chain and to one ratio, the pinion 38 W11]. merely serve rotates a clutch mem er 14 mounted on a as an idler gear which rotates on disc 36.

0 sleeve 15 with the sprocket 13. The power When the gears 30-31 are not engaged upon shaft 16 carries a complementary clutch memgears 28 or 29, the drive is through pinions 39, her. 17 which is operable through a clutch 38 and ring gear 34, but at this time the pinlever 18 for rotatmg bevel gear 19 which ion 35 and shaft 27 .are held fast against romeshes with bevel gear 20 keyed to the main tation by means of a tooth 40 which may be drive shaft 21. Drive shaft 21 has suitable integral with the casing and which meshes bearings 22 and 23 mounted in webs or plates with the gear 31. Therefore the ring gear 24 and 25 which are secured in or made inteis held stationary and the disc 36 is driven at gral with the stationary housing 26. A couna speed determined by the ratio between ter-shaft 27 is likewise journaled in said webs pimon 39 and the ring gear 34. From the or plates 24 and 25. Gears 28 and29 are oregoing it will be apparent that a multiplicity of speeds may be had by providing vat-ios between the shafts 21 and 27 and that if the ratio of drive between gear 35 and ring gear 33 be sufliciently high in proe ratio between pinions 39 an a reverse rotation rious gear ra portion to th eared engag Thus it will be noted tween pinion 42 o tionary ring gear that the speed wit 41 rot-ates will always gears 28 or 29. Wh 5 mediate its limits of reciproc tionary collar 52 pr 45 rin 51 and carries on its ex 53 isposed at angles to one ano slots the lever 49 may seat to r dental rotation of shaft 43.

gear 34, the result will be of the disc 36'. A shaft 41 is suitably journaled in hub port-ion 37 of the disc 36 and has a pinion 42 keyed thereon in mesh with a stationary or fixed ring gear 420. This shaft 41 tator 12 in the device shown in d through a circumference is rotated by reason of its ement with the ring gear 420.

that the gear ratio ben the agitator and the sta- 420 is always constant so h which the agitator shaft be proportionate to the s eed of rotation of the hub 37 which carries carries the agi Fig. 1 and is move by the disc 36 and said shaft 41 through a circumference in the mixing bowl. The opera comprises a shaf and reciprocated i the inside of hous1 pinion with which is en rack 46 having a yok of slidable gear mem 30 noted that oscillation o reciprocation of the rack 46 and consequently a reciprocation of the gear unit 3031 upon counter-shaft 27 to effect engagement with en the rack 46 is interation the gears ting device for shifting gears t 43 which may be oscillated n a suitable bearing 44 on ng 26. Shaft 43 carries a aged a slidable acing the body ber 30-31. It will be f the shaft 43 effects he opposite h The resultant rotation of disc 36 is therefore slower. If the speed of the ring gear is increased so that the ring gear tends to roinion 38 faster than pinion 39 drives disc 36 will rotate in the opposite direction. In other words the efiect will be the same as if the drive pinion 39 were stationary and the ring gear wererotated at a slower speed. By altering the gear ratio through the counter-shaft various forward and reverse s eeds'are attained.

In view 0 the fact that the mechanism end of the shaft 43 carries a socket 54 which contains a swivel ball end of a link 56 which has ivotal connection with the free outer end 0 clutch lever 18. From the forew-illbeapparent that when d out of a slot 53 in order haft. said shaft 43 ulling the free end it and thereby dis- 14-17 and thus breaking on to the drive shaft 21.

The shaft 43 may then be rotated by turning the lever 49 so that the gear unit 30-31 may be moved to the several positions, for example as shown in Fig. 2 with the gear 31 locked on tooth 40, or it may be moved to engage gears 29 and 31, or gears 28 and 30. It will be noted goingdescriptionfit the lever 49 is pulle 55 to permit rotation of the s will move longitudinally, p of the clutch lever with engaging the clutch the power connectl that the gear shift mechanism is selective. When the sired position the operation of seating the lever into the selected notch 53 simultanelocks the shaft 43 against further rotad again engages the clutch members 14-17. As shown in Fig. 2 a protective drip pan 57 is secured for rotation with the disc 36, hub 37 and associated parts. A tubular stationary drum 58 is secured to the lower end 59 of housing 26 to protect the parts against dust and to prevent escape of lubricant into the mixing bowl.

It will be understood that in constructhanism of the invention for a cake described thus far, the gear ratios between the several gears, pinions and ring gears may be so selected as to exclude reverse rotation if desired.

The operation of the device will be readily understood. Whenever the operating lever 49 is pulled out of the slot in the device shown in Figs. 1, 2 and 3 no power is transmitted to the shaft 21. At this time the lever may be turned to move the rack for positioning gears 30 and 31, or in other words selecting the speed desired. The several speeds are attained in the manner set forth concurrently with the description of ts and will not require repetition. stated when the ring gear 32 is held stationary it serves as a rack over which pinion 38 travels under the power from pinion 39 for imparting rotation to the d1sc 36. When the ring gear is power driven through 30-31 are out Of engagement with those 011 gear 35 its tendency is to move the pinion shaft 21 but the gear 31 is locked by its en- 38 in th gagement with the stationary tooth 40*. end of shaft 43 is slotted at 48 and a lever 40 49 is pivotally mounted in said slot for turning the shaft. One end of the lever 49 is pivotally mounted on an arm 50 carried by a rotatable ring 51 on the bearing 44. A staecludes reciprocation of posed face slots ther in which eclude acciously tion an ing a mec mixer as the par Briefly tate p it the described may, with obvious modifications be adapted to numerous uses, the invention herein is not limited to the exact struc ure shown but will be understood to be inter-. preted within the scope of the ap nded claims.

What is claimed is-- 1. In a device of the class describedthe combination of a driven member comprisin a revoluble disc, a pinion mounted eccentrically on the disc, a drive shaft co-axial with the disc, a ring gear freely revoluble on th drive shaft, a pinion on the drive sha meshing with the pinion on the disc, counter-shaft having geared connection wit the ring gear, means for driving the counter ears have been shifted to the desame direction as does pinion 39.

shaft from the drive shaft and means for locking the counter-shaft against rotation.

2. In a variable speed drive mechanism for an agitator the combination of a drive shaft, a driven member, a pinion mounted eccentrically on the driven member, a pinion on the drive shaft meshing with the eccentrically mounted pinion, an internal ring gear mounted for rotation on the drive shaft and meshing with the eccentric pinion, a stationary internal ring gear, an agitator shaft mounted eccentrically on the driven member,h a pinion on the agitator shaft meshing wit a stationary ring gear and means whereby the rotatable ring gear may at times driven at different speeds to impart rotation to the driven member for attaining proportional epicycloidal movement of the agitator shaft.

3. In combination a drive shaft, a countershaft, a driven member co-axial with the drive sha a ring gear rotatably mounted on the drive shaft, means for driving ring gear at pre-determined speeds from the counter-shaft, a pinion on the drive shaft. an eccentrically mounted pinion on the meshing with said pinion and said ring gear, a stationary ring gear, an agitator shaft journalled eccentrically on he driven member and a pinion on said agitator shaft meshing with the stationary ring gear for imparting rotation to the agitator shaft proportional to the speed of bodily movement thereof as it is carried by the riven member. 4. In combination a drive shaft, an internal gear, a driven member concentric with the drive shaft, a pinion on the driven member operatively connected with the drive shaft and internal ear and means controlling and actuatin t e internal gear whereby said gear may be xed to attain high rotation of the driven member and whereby the internal gear is rotatablein one direction at various increased speeds to roduce rotation of the driven member at rediiced speeds, the ring gear being driven at increased rates of rotation to attain zero rotation and reverse rotation of the driven member.

5. In a device of the class described the combination of a drive shaft, a counter-shaft adapted to be driven at pro-determined different speeds from the drive shaft, means to hold the counter-shaft against rotation, a revoluble ring gear adapted for movement and fixation by the counter-shaft, a driven member having an eccentrically mounted pinion operatively connected with the drive shaft and said ring gear whereby the driven member is rotated at a speed dependent upon the difference in speeds of the drive shaft and said ring gear, an agitator shaft journalled eccentrically in the driven member, a stationary ring gear, a pinion fixed on the meshing with the ring agitator shaft and I combination of a drive shaft the th gear and means for altering the speed of rotation of the rotatable ring gear relative to the drive shaft.

6. In a device of the class described the a concentric driven member journalled thereon, a fixed ring gear and a floating ring gear mounted concentrically of the drive shaft, means comprising pinions on the driven member for engagement with the fixed and floating ring gears, means for establishing a constant driving connection between the drive shaft and one of said pinions and means for arresting the floating ring gear and for selective driving connection from the drive shaft whereby to impart various rates of rotation to the floating ring gears.

7. In a device of the class described the combination with a driven disc having a rotatable agitator shaft therein of a fixed ring gear operating on the agitator shaft, a floatmg ring gear, a drive shaft concentric with e ring gears and the driven member, pinions on the drive shaft and driven member whereby the floating ring gear may be driven from the drive shaft, a xed member, a counter shaft having a pinion in constant mesh with the floating rin gear and means. slidable longitudinally of the counter shaft to engage the fixed member for fixation of the counter shaft and floatin ring gear and for lmparting selected spee s to the counter shaft from the drive shaft.

In testimony whereof, I have hereunto subscribed my name this 2nd day of December, 1927.

SIGMUND SCHIFF. 

